selftest/reproducible: add an exclusion list for items that are not yet reproducible

Hopefully over time this list will be reduced to an empty one.

Non-reproducible excluded packages are not given to diffoscope and do not cause a
failure, but still saved side-by-side with non-reproducible failing ones to make
investigation easier.

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>